I use eheims, never had a problem but than again i never trust a heaters thermostat to keep and accurate and consistent temperature in my tanks with thousands of dollars worth of inhabitants. Not to mention the countless hours it takes to put a successful tank together. My heater(s) are always controlled by my apex or some other sort of controller.
+1; the jagers are pretty popular and yes, ideally you should run them through a controller. At a minimum, use two smaller heaters so that if one malfunctions it won't completely fry your tank.
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